Drill.



Patented lune-'3, I902. E. E. ATKINSON.

DRILL;

(Applieatioxi filed Dec. 2, 1901.

(No Model.)

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' .U TEEST iAT EDWARD E. ATKINSON, OF ADA, OHIO, ASSIGNOR OF ONE-HALF TO ISRAEL FATEQ OFFICEQ v OBERLIN, OF ADA, OHIO.

DR|LL..

SPECIFICATION formingpart of Letters Patent 1\T o'. 701,792, dated June 3, 1902.

7 Application filed. December 2, 1901. Serial No. 84,429. (No model.)

the object thereof is to provide a novel connection between the bit and stem which will permit of the ready disassociation and assembling of said members and form a lock that will securely fasten them. together, at the same time being protected from injury and accidental derangement.

One of the features of the invention resides in a novel form of key, which coacts with the members to securely hold them together and yet is readily detachable to permit the dismemberment of the drill.

The preferred embodiment of the invention are illustrated in the accompanying sheet of drawings, and the construction and operation thereof are fully described in the following specification.

In the drawings, Figure 1 is a side elevation of adrill embodying the presentimprovements. Fig. 2 is a vertical sectional view through the same. Fig. 3 is a perspective view of the key detached from the drill, and Fig. 4 is a vertical transverse sectional View through said key.- Fig. 5 is a perspective view of the bolt-lock.

Similar numerals of reference designate corresponding parts in all the figures of the drawings.

Two members of the drill are illustrated, a bit 10 and a stem 11, and said members have theirjadjacent ends interlocked. This is preferably accomplished by providing a socket 12 in the lower end of the stem and a shank 13 on the upper end of the bit, said shank fit ting snugly .within the socket, as shown in Fig. 2. The shank 13 and the portion of the stem 11 surrounding the same are provided with transverse openings 14.,that are arranged to be placed in alinement to receive the key, (designated as a whole by 15.) In order to easily obtain this alinement, the lower end of the stem is preferably provided with lugs turning vof said bolt.

' 16, that engage in corresponding recesses 17 in the shoulder formed at the base of the shank 13. h

The key 15 comprises a pair of clampingblocks 18, that are'arranged to pass through the'alined openings of the shank and stem,

and a wedge 19 is slidably mounted between these blocks to force them apart. The outer faces of the blocks 18 are preferably parallel, while the inner face of the upper block is inclined with relation to the opposing inner face of the lower block. Both of these inner faces are furthermore provided with longitudinally-disposed grooves 20, as shown in Fig. 4. The wedge 19 has its opposite faces formed to bear upon the opposing inner faces of blocks 18, and, furthermore, is provided with ribs 21, that engage in the grooves 20 of said blocks. For the purpose of adjusting the wedge the lower block is provided on its inner face with an ear 22, in which is journaled a bolt 23, having a squared head 24 at its outer end, the opposite end being threaded, as shown at 25, and engaging a nut 26 set'into the wedge. Instead of this nut 26 it will be apparent that the wedge might be provided with a threaded opening in which the bolt engaged. A bolt-lock 23*, comprising a rectangular collar, detachably fits over the head 24 in the opening and prevents the A guard-collar 27 is threaded upon the lower end'of the stem and is arranged to be screwed down so as to cover the openings 14, and thus completely house the key.

It will be noted by referring to Fig. 2 that when the bit and stem are placed in coacting relation the end walls of the openings through the shank 12 and said stem are not in alinement, so that when the clamping-blocks 18 are passed through the openings the upper one will bear only against the shank 13, while the upper edge of the opening through the shank 13, and thereby holds the block against movement with the wedge 19. When the stem and bit have been properly secured, the guard-sleeve is threaded down to cover the opening, and thus protect the key from injury. To remove the bit, it is only necessary to raise this sleeve and rotate the bolt 23, thereby releasing the wedge 19 and permitting of the clamping-blocks being brought together, so that the key may be removed as a whole. This releases the drill members and the bit can be readily withdrawn. By this construction it will be seen that an exceedingly simple arrangement is provided which will do away with the necessity of large cumbersome wrenches and will securely hold the bit and stem of a drill together, at the same time permitting of their being easily and readily disassociated.

From the foregoing it is thought that the construction, operation, and many advantages of the herein-described invention will be apparent to those skilled in the art without further description, and it will be understood that various changes in the size, shape, proportion, and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a drill, a stem, and a bit having interlocking portions provided with transverselydisposed alined openings, and a key located within said openings, said key including a block having a journal-bearing, a wedge movable upon the block, and an actuating device journaled in the bearing of the block and being held against longitudinal movement therein, said actuating device having an engagement with the wedge to move it toward the journal upon the rotation of the actuating device.

2. In a drill, a stem, and a bit having interlocking portions provided with transverselydisposed alined openings, and a key located within said openings, said key including a clamping-block having a journal-bearing, a wedge longitudinally movable upon the block,

and a screw journaled in the bearing of the block and being held therein against longitudinal movement, said screw having a threaded engagement with the wedge to move it toward the journal upon the rotation of said screw.

3. In a drill, a stem, and a bit having interlocking portions provided with transverselydisposed openings, and a key located within said openings, said key comprising a pair of spaced blocks one of which is provided with an car, a wedge movably located between the blocks to spread them apart, and an operating-screw j ournaled in the ear and held against longitudinal movement therein, said screw having a threaded engagement with the wedge, whereby upon its rotation said wedge will be moved.

4. In a drill, the combination with a stem and a bit havinginterlocked portionsprovided with transverse openings, the end walls of which are arranged out of alinement, of spaced clamping-blocks bearing against the opposite Walls of the openings and having their inner walls arranged in convergent relation, an ear secured to one of the blocks at theirconvergent ends, a wedge movable between the blocks, an operating-screw journaled in the ear and having its threaded end screwed into the wedge, and a guard-sleeve fitted over the openings and covering the key.

5. In a drill, a stem and a bit having interlocking portions provided with alined openings, and a key removably mounted in the openings and comprising spaced clampingblocks having parallel outer faces and inner faces disposed in inclined relation, one of said blocks having an ear projecting from its inner face, a wedge mounted between and slidable longitudinally of the blocks, an operatingscrew journaled in the ear and having a 

